Question

A current is flowing in the circular loop. The magnetic field lines point from B to A inside the loop. The north pole of loop is__________.

• A. B
• B. A
• C. A if the current is small
• D. B if the current is large

Answer 1

The correct option is B A

The magnetic field lines are closed loops. The magnetic field lines originate at the north pole and end at the south pole outside the magnet. Inside the magnet, the magnetic field lines move from south pole to northpole.
Since the magnetic field lines point from B to A inside the loop, we can infer, A is the north pole.